DuplicateColumnException

Thrown when a column name is registered twice on one response.

Raised by {\CNIC\AbstractResponse::registerColumn()}. A response's column list is keyed by name — getColumn() resolves a name to one position — so a second column under the same name cannot be represented: the list would hold a column getColumn() can never return (RSRMID-2939).

Unreachable from either shipped brand, and from a substitute {\CNIC\ResponseParserInterface} too: both brands derive their column names from array_keys() of the parsed hash, and two distinct PHP array keys cannot stringify to the same name. It exists for a future brand whose populate() builds its columns some other way — there a repeated name is a programming error and says so rather than half-registering the column, the same policy as {\CNIC\Exception\UnsupportedFeatureException} for a non-string CNR cell.